Re-instate 369051.
Re-instate 369051.

Looks like I accidentally reverted r369051 to the old
CMake-version-specific flag when committing 369055.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@369067 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt